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Credit: AFP/Getty Images

The screen-used Kryptonite crystal from the film "Superman III" on display at Profiles In History in Calabasas, northwest of downtown Los Angeles, on July 19, 2012 in California, ahead of a public auction which begins on July 28. Auction house Profiles in History, the world's largest auctioneer and dealer of original Hollywood memorabila, will handle the sale of the celebrated Drier Collection, which due to its size, scope and significance, will take nearly two years and several auctions for all of the material to be offered. The green resin "crystal" formation of the mineral which was Superman's only weakness, comes in a box and is estimated between $6,000 - $8,000. AFP PHOTO/Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/GettyImages)